Simon Property Group is a leading real estate investment trust (REIT) based in the United States. It primarily focuses on owning, developing, and managing retail properties, including shopping malls and premium outlets. Founded in 1960, the company has grown to become one of the largest retail real estate companies in the world. The company operates a diverse portfolio of properties across the country and internationally. Simon Property Group is known for its commitment to enhancing the shopping experience through innovative design and tenant mix, making it a key player in the retail real estate market.